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var(--line);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);background:#fffc;flex-direction:column;gap:20px;height:100vh;padding:24px 18px;display:flex;position:sticky;top:0}.side-nav{gap:8px;display:grid}.nav-link{color:var(--muted-strong);border-radius:14px;align-items:center;gap:12px;padding:12px;font-weight:800;display:flex}.nav-link:hover,.nav-link.active{color:var(--blue-dark);background:#edf3ff}.shell-main{min-width:0;padding:22px}.topbar{z-index:10;width:min(100%, var(--shell-width));border:1px solid var(--line);-webkit-backdrop-filter:blur(18px);backdrop-filter:blur(18px);background:#ffffffd1;border-radius:22px;justify-content:space-between;align-items:center;gap:16px;margin:0 auto 22px;padding:12px;display:flex;position:sticky;top:0}.stat-row{flex-wrap:wrap;justify-content:flex-end;gap:8px;display:flex}.content{width:min(100%, var(--shell-width));margin:0 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p{color:var(--muted);margin:0;line-height:1.45}.panel{padding:18px}.panel+.panel{margin-top:16px}.progress-bar{background:#e8eef8;border-radius:999px;height:12px;overflow:hidden}.progress-fill{border-radius:inherit;background:linear-gradient(90deg, var(--green), var(--blue));height:100%}.profile-grid,.achievements-grid{grid-template-columns:repeat(3,minmax(0,1fr));gap:14px;display:grid}.metric-card,.achievement-card{padding:16px}.metric-card strong{margin-top:10px;font-size:1.7rem;display:block}.leader-list{gap:10px;display:grid}.leader-row{grid-template-columns:42px minmax(0,1fr) auto;align-items:center;gap:12px;padding:12px;display:grid}.avatar{color:#fff;background:var(--purple);border-radius:15px;place-items:center;width:42px;height:42px;font-weight:900;display:grid}.lesson-runner{gap:18px;max-width:780px;margin:0 auto;display:grid}.runner-top{align-items:center;gap:12px;display:flex}.runner-top .progress-bar{flex:1}.question-card{padding:clamp(18px,4vw,30px)}.question-card h1{margin:0 0 20px;font-size:clamp(1.7rem,5vw,3rem);line-height:1.08}.option-list{gap:12px;display:grid}.option-button{border:2px solid var(--line);width:100%;color:var(--text);text-align:left;background:#fff;border-radius:16px;padding:16px;font-weight:850}.option-button.selected{border-color:var(--blue);background:#edf3ff}.option-button.correct{border-color:var(--green);background:var(--green-soft)}.option-button.wrong{border-color:var(--red);background:var(--red-soft)}.feedback{border-radius:18px;gap:12px;padding:16px;font-weight:750;display:grid}.feedback.correct{color:#064530;background:var(--green-soft)}.feedback.wrong{color:#68212b;background:var(--red-soft)}.feedback.pending{color:var(--fg-muted);background:var(--surface);border:2px dashed var(--border);align-items:center;min-height:56px;padding-left:20px;display:flex}.result-hero{text-align:center;gap:18px;max-width:720px;margin:0 auto;display:grid}.result-badge{color:#2f2100;background:var(--yellow);border-radius:36px;place-items:center;width:118px;height:118px;margin:0 auto;display:grid;box-shadow:0 20px 45px #ffbf3c52}.settings-form{gap:14px;max-width:620px;display:grid}.field{color:var(--muted-strong);gap:8px;font-weight:800;display:grid}.field select{border:1px solid var(--line);min-height:48px;color:var(--text);background:#fff;border-radius:14px;padding:0 12px}@media (max-width:860px){.hero,.dashboard-grid{grid-template-columns:1fr}.hero{padding-top:8px}.phone-preview{max-width:340px}.hero-points,.profile-grid,.achievements-grid{grid-template-columns:1fr}.app-shell{padding-bottom:76px;display:block}.sidebar{z-index:20;border:1px solid var(--line);height:auto;box-shadow:var(--shadow);border-radius:24px;padding:8px;position:fixed;inset:auto 10px 10px}.sidebar .brand{display:none}.side-nav{grid-template-columns:repeat(5,1fr)}.nav-link{justify-content:center;padding:11px 8px}.nav-link span{display:none}.shell-main{padding:12px}.topbar,.page-head,.lesson-card{align-items:stretch}.topbar,.page-head{flex-direction:column}.stat-row{justify-content:flex-start}}@media (max-width:560px){.landing-header{align-items:flex-start}.landing-actions{flex-direction:column}.button{min-height:42px;padding:0 14px}.hero-copy h1{font-size:clamp(2.35rem,15vw,4rem)}.lesson-card{grid-template-columns:auto minmax(0,1fr)}.lesson-card .button{grid-column:1/-1}}